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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities    
Net loss $ (32,898) $ (36,242)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 833 900
Stock-based compensation 7,013 5,273
Non-cash lease expense 567 526
Non-cash investment income, net (910) (1,182)
Other (69) 18
Changes in operating assets and liabilities:    
Accounts receivable 126 (47)
Other receivables 11,291 (5,310)
Prepaid expenses and other assets (10) 465
Accounts payable 455 (442)
Accrued and other current liabilities (575) (2,301)
Deferred revenue (12) 11,154
Net cash used in operating activities (14,189) (27,188)
Cash flows from investing activities    
Purchases of marketable securities (35,831) (54,143)
Proceeds from maturities and sales of marketable securities 48,675 54,398
Purchases of property and equipment (56) (128)
Proceeds from disposal of property and equipment 0 311
Purchases of intangible assets (1,045) 0
Net cash provided by investing activities 11,743 438
Cash flows from financing activities    
Proceeds from exercise of stock options 2,902 1,095
Proceeds from employee stock purchase plan 147 123
Finance lease principal payments (440) (466)
Net cash provided by financing activities 2,609 752
Net increase (decrease) in cash and cash equivalents 163 (25,998)
Cash and cash equivalents at beginning of period 3,880 29,878
Cash and cash equivalents at end of period 4,043 3,880
Supplemental disclosure of cash flow information    
Cash paid for interest 28 55
Supplemental disclosure of non-cash investing and financing information    
Issuance of stock to settle accrued and other current liabilities 406 0
Purchases of property and equipment in accounts payable and accrued and other current liabilities $ 0 $ 20